Prediction of the state of the ice-bearing massif during the penetration of a vertical mine shaft with freezing

Abstract

Te subject and purpose of the work. Te article is devoted to the problem of sinking shafs traversed by the method of artifcial freezing of shafs at the stage of elimination of ice and rock fencing. Te relevance of the study is explained by the increased requirements for the reliability of the process during the tamponage of the fxed space of the trunks and during the operation of the trunks for an indefnite time. Te novelty of the article consists in the development of the parameters of the technology that eliminates the uneven load on the tubing support during the expansion of the inner ring layer during artifcial thawing by pumping hot brine into freezing columns. Te methodology of the work includes a complex of studies: analysis of literary sources, theoretical and feld studies, modeling of processes and experimental verifcation of the data obtained. Te results of the work. It was revealed that the stresses in the support lead to the separation of concrete from the tubing column and the formation of water-flled cavities. It is established that forced thawing of the array by pumping hot brine into freezing columns causes uneven loads on the tubing support and threatens with an accident. It is determined that the most acceptable option is thawing by feeding warm air into the barrel and circulating a coolant with an optimal temperature. Use of results. Te technology can be in demand in the construction of capital mining facilities in particularly unfavorable conditions. Conclusions. Te most favorable mode of artifcial thawing is created when heated air is fed into the barrel and the coolant into the columns with an increase in the coolant temperature smoothly while maintaining the required level.